US 8,555,713 B2 · Assignee: Glory Ltd. · Inventors: Sasaki; Tomoyuki
Sheet 1 of 12 from the published document. All sheets in the USPTO PDF
A coin recognizing device is configured in which a main-judgment-frame registration unit registers main judgment frames for each denomination including value ranges corrected so that a value range corresponding to data of at least one of recognition elements does not overlap with a value range corresponding to the same recognition element of any other denominations, an auxiliary-judgment-frame registration unit registers auxiliary judgment frames for a specific denomination including value ranges of the recognition elements of a coin of which data does not fall within the main judgment frames for the specific denomination but is to be judged as a coin of the specific denomination, and a judging unit judges a coin of which data falls within either the main judgment frames or the auxiliary judgment frames and does not fall into the reject judgment frames as a coin of a denomination corresponding to the main judgment frame.
A coin recognizing device that recognizes a denomination or authentication of a coin checks various elements such as a diameter, a material, a design, and a thickness of the coin as a recognition target according to outputs from a magnetic sensor or an optical sensor. This check is performed by judging whether sensor outputs corresponding to the elements of a genuine coin are included in predetermined value ranges (hereinafter, a set of value ranges to be used for the judgment is referred to as "judgment frame"). A coin recognizing device that judges a denomination by using a judgment frame is disclosed in Patent Document 1, for example. In the coin recognition by using the judgment frame, for example when all sensor output values are included in value ranges of a specific judgment frame, respectively, a coin is judged to be a genuine one of a denomination corresponding to the judgment f
1 of 12 drawing sheets so far from the published document, cropped to the drawing. Every sheet is in the USPTO PDF.
What the patent claimed, word for word. All of it is now free to use.
The present invention relates to a coin recognizing device and a coin recognizing method for recognizing a coin based on whether a plurality of elements according to sensor outputs are included in predetermined value ranges, respectively, and more particularly to a coin recognizing device and a coin recognizing method that enable to handle coins of various countries and to flexibly address additions or changes of recognition targets.
A coin recognizing device that recognizes a denomination or authentication of a coin checks various elements such as a diameter, a material, a design, and a thickness of the coin as a recognition target according to outputs from a magnetic sensor or an optical sensor. This check is performed by judging whether sensor outputs corresponding to the elements of a genuine coin are included in predetermined value ranges (hereinafter, a set of value ranges to be used for the judgment is referred to as "judgment frame"). A coin recognizing device that judges a denomination by using a judgment frame is disclosed in Patent Document 1, for example.
In the coin recognition by using the judgment frame, for example when all sensor output values are included in value ranges of a specific judgment frame, respectively, a coin is judged to be a genuine one of a denomination corresponding to the judgment frame. The judgment frame having a set of predetermined value ranges is used because even genuine coins have individual differences and also the sensors have individual differences. This is also because the respective sensor outputs vary between new coins that have recently been released and circulated coins that have already been circulated in the market. Therefore, when the judgment frame having a set of predetermined value ranges is used, erroneous rejection of a genuine coin can be prevented.
Collection of samples with large amounts of new coins and circulated coins is required to create the judgment frame for each denomination. For example, when recognition targets are Japanese coins, it is easy to acquire new coins and circulated coins in Japan. Therefore, there is no particular problem in creating judgment frames previously when a coin recognizing device is developed, or re-creating a new judgment frame when a new coin is released.
Patent Document 1: Japanese Patent Application Laid-open No. 2003-256902
Problem to be Solved by the Invention
However, when a coin recognizing device that recognizes coins of other countries is to be developed, it is difficult to acquire large amounts of new coins and circulated coins of the countries at the time of development of the coin recognizing device, and therefore creation of judgment frames itself is difficult.
After introduction of the coin recognizing device, when a pass rate (a rate at which genuine coins are judged to be genuine) is reduced or when rejection targets are increased due to appearance of a new forged coin or the like, such an event needs to be promptly handled. However, in the conventional method using the judgment frame, change of the judgment frame cannot be performed easily and a prompt action is difficult.
For this reason, how a coin recognizing device or a coin recognizing method realizes handling coins of various countries and also flexibly addressing addition or change of a recognition target while performing the coin recognition using the judgment frame has been a major issue.
The present invention has been achieved to solve the problem of the conventional technique, and it is an object of the present invention to provide a coin recognizing device and a coin recognizing method that enable to handle coins of various countries and also to flexibly address addition or change of a recognition target while performing the coin recognition using the judgment frame.
Means for Solving Problem
To solve the problems described above and achieve the object, the present invention is a coin recognizing device for recognizing a coin based on whether data of a plurality of recognition elements of the coin according to sensor outputs are included in predetermined value ranges, respectively. The coin recognizing device includes a main-judgment-frame registration unit for registering a main judgment frame for each denomination including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to the same recognition element of any other denominations; an auxiliary-judgment-frame registration unit for registering an auxiliary judgment frame for each denomination including the value ranges of the recognition elements of a coin of which data does not fall within the main judgment frame but is to be judged as that of a specific denomination; and a judging unit for judging a coin of which data falls within the main judgment frame or the auxiliary judgment frame as a coin of a denomination corresponding to the main judgment frame.
The present invention is a coin recognizing device for recognizing a coin based on whether data of a plurality of recognition elements of the coin according to sensor outputs are included in predetermined value ranges, respectively. The coin recognizing device includes a main-judgment-frame registration unit for registering a main judgment frame for each denomination including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to the same recognition element of any other denominations; a reject-judgment-frame registration unit for registering a reject judgment frame for each denomination including the value ranges of the recognition elements of a coin of which data falls within the main judgment frame but that is not to be judged as that of a specific denomination; and a judging unit for judging a coin of which data falls within the main judgment frame and does not fall within the reject judgment frame as a coin of a denomination corresponding to the main judgment frame.
The present invention is a coin recognizing device for recognizing a coin based on whether data of a plurality of recognition elements of the coin according to sensor outputs are included in predetermined value ranges, respectively. The coin recognizing device includes a main-judgment-frame registration unit for registering a main judgment frame for each denomination including the value ranges that are corrected so that the value range corresponding to a distribution of data of at least one of the recognition elements does not overlap with the value range corresponding to that of the same recognition element of any other denominations; an auxiliary-judgment-frame registration unit for registering an auxiliary judgment frame for each denomination including the value ranges of the recognition elements for a coin of which data does not fall within the main judgment frame but that is to be judged as a coin of a specific denomination; a reject-judgment-frame registration unit for registering a reject judgment frame for each denomination including the value ranges of the recognition elements for a coin of which data falls within the main judgment frame of a specific denomination or the auxiliary judgment frame of the specific denomination but that is not to be judged as a coin of the specific denomination; and a judging unit for judging a coin of which data falls within either the main judgment frame or the auxiliary judgment frame and does not fall within the reject judgment frame as a coin corresponding to the main judgment frame.
In the present invention, when all of the value ranges corresponding to respective recognition elements of the specific denomination overlap with all of the respective value ranges corresponding to the same respective recognition elements of any other denominations, the main-judgment-frame registration unit performs correction so as to determine one recognition element of which the data distributions are the most distant from each other between the specific denomination and any of the overlapping denomination, and to correct so that at least any one of the value ranges of the most distant element of the overlapping denominations do not overlap each other.
In the present invention, when the value range corresponding to a specific recognition element is corrected by the main-judgment-frame registration unit not to overlap with the value range corresponding to the same recognition element of any other denominations, the auxiliary-judgment-frame registration unit registers the auxiliary judgment frame having the value range that has been overlapped before the correction as a value range related to the specific recognition element, and having ranges of respective data of other recognition elements included in the value ranges as value ranges related to the other recognition elements.
In the present invention, the auxiliary-judgment-frame registration unit is capable of registering a plurality of the auxiliary judgment frames for each denomination, and the reject-judgment-frame registration unit is capable of registering a plurality of the reject judgment frames for each denomination.
In the present invention, when the plural auxiliary judgment frames or the plural reject judgment frames are registered for each denomination, the auxiliary judgment frames or the reject judgment frames are compared with each other, and when value ranges corresponding to any recognition element have an overlapped part of data or are next to each other with respect to each of all the recognition elements, integration is performed to combine relevant judgment frames into one judgment frame having a continuous value range.
The present invention is a coin recognizing method for recognizing a coin based on whether data of a plurality of recognition elements according to sensor outputs are included in predetermined value ranges, respectively. The coin recognizing method includes a main-judgment-frame registration step of registering a main judgment frame for each denomination including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to the same recognition element of any other denominations; an auxiliary-judgment-frame registration step of registering an auxiliary judgment frame for each denomination including the value ranges of the recognition elements for a coin of which data does not fall within the main judgment frame but that is to be judged as a coin of a specific denomination; and a judging step of judging a coin of which data falls within the main judgment frame or the auxiliary judgment frame as a coin of a denomination corresponding to the main judgment frame.
The present invention is a coin recognizing method for recognizing a coin based on whether data of a plurality of recognition elements according to sensor outputs are included in predetermined value ranges, respectively. The coin recognizing method includes a main-judgment-frame registration step of registering a main judgment frame for each denomination including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to the same recognition element of any other denominations; a reject-judgment-frame registration step of registering a reject judgment frame for each denomination including the value ranges of the recognition elements for a coin of which data falls within the main judgment frame but that is not to be judged as a coin of a specific denomination; and a judging step of judging a coin of which data falls within the main judgment frame and does not fall within the reject judgment frame as the coin of a denomination corresponding to the main judgment frame.
The present invention is a coin recognizing method for recognizing a coin based on whether data of a plurality of recognition elements according to sensor outputs are included in predetermined value ranges, respectively. The coin recognizing method includes a main-judgment-frame registration step of registering a main judgment frame for each denomination including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to the same recognition element of any other denominations; an auxiliary-judgment-frame registration step of registering an auxiliary judgment frame for each denomination including the value ranges of the recognition elements for a coin of which data does not fall within the main judgment frame but that is to be judged as a coin of a specific denomination; a reject-judgment-frame registration step of registering a reject judgment frame for each denomination including the value ranges of the recognition elements for a coin of which data falls within the main judgment frame or the auxiliary judgment frame but that is not to be judged as a coin of a specific denomination; and a judging step of judging a coin of which data falls within either the main judgment frame or the auxiliary judgment frame and does not fall within the reject judgment frame as a coin corresponding to the main judgment frame.
Effect of the Invention
According to the present invention, the main judgment frame including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to the same recognition element of any other denominations is registered for each denomination, the auxiliary judgment frame including the value ranges of the recognition elements for a coin of which data does not fall within the main judgment frame but is to be judged as that of a specific denomination is registered for each denomination, and a coin of which data falls within the main judgment frame or the auxiliary judgment frame is judged as a coin corresponding to the main judgment frame. Therefore, by using the main judgment frame, and the auxiliary judgment frame for passing coins that are rejected by the main judgment frame but are originally not to be rejected, coins of various countries can be handled, and addition or change of recognition targets can be flexibly addressed.
According to the present invention, the main judgment frame including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to the same recognition element of any other denominations is registered for each denomination, a reject judgment frame including the value ranges of the recognition elements for a coin of which data falls within the main judgment frame but is not to be judged as that of a specific denomination is registered for each denomination, and a coin of which data falls within the main judgment frame and does not fall within the reject judgment frame is judged as a coin of a denomination corresponding to the main judgment frame. Therefore, by using the main judgment frame, and the reject judgment frame for rejecting coins that are not rejected by the main judgment frame but are originally to be rejected, coins of various countries can be handled, and addition or change of recognition targets can be flexibly addressed.
According to the present invention, the main judgment frame including the value ranges that are corrected so that the value range corresponding to at least one of the recognition elements does not overlap with the value range corresponding to that of the same recognition element of any other denominations is registered for each denomination, the auxiliary judgment frame including the value ranges of the recognition elements for a coin of which data does not fall within the main judgment frame but is to be judged as a coin of a specific denomination is registered for each denomination, the reject judgment frame including the value ranges of the recognition elements for a coin of which data falls into the main judgment frame or the auxiliary judgment frame but that is not to be judged as a coin of the specific denomination is registered for each denomination, and a coin of which data falls within either the main judgment frame or the auxiliary judgment frame and does not fall within the reject judgment frame is judged as a coin corresponding to the main judgment frame. Therefore, by using the auxiliary judgment frame for passing coins that are rejected by the main judgment frame but are originally not to be rejected, and the reject judgment frame for rejecting coins that are not rejected by the main judgment frame or the auxiliary judgment frame but are originally to be rejected, coins of various countries can be handled, and addition or change of recognition targets can be flexibly addressed.
According to the present invention, when the value ranges corresponding to all the recognition elements overlap with the value ranges corresponding to the same respective recognition elements of any other denominations, correction is performed so as to determine one recognition element of which the data distributions are the most distant from each other between the specific denomination and any of the overlapping denomination. Therefore, by performing the correction so that the main judgment frames do not overlap with each other with respect to a recognition element that tends to have a largest difference, the main judgment frames corresponding to respective denominations can be separately registered.
According to the present invention, when the value range corresponding to a specific recognition element is corrected not to overlap with the value range corresponding to the same recognition element of any other denominations, an auxiliary judgment frame having the value range that has been overlapped before adjustment as a value range related to the specific recognition element, and having ranges of respective data for other recognition elements included in the value range as value ranges related to the other recognition elements is registered. Therefore, when correction is performed so that specific recognition elements in the overlapped main range frames do not overlap with each other, a set of value ranges for each recognition element that can be taken by respective data corresponding to a corrected part is automatically registered in an auxiliary judgment frame. Accordingly, coins corresponding to the corrected part of the main judgment frame can be passed by the auxiliary judgment frame corresponding to the main judgment frame.
According to the present invention, a plurality of the auxiliary judgment frames can be registered for each denomination, and a plurality of the reject judgment frames can be registered for each denomination. Therefore, cases where new counterfeit coins appear or qualities of circulated coins change can be also flexibly addressed.
According to the present invention, when the plural auxiliary judgment frames or the plural reject judgment frames are registered for each denomination, the auxiliary judgment frames or the reject judgment frames are compared with each other. When the value ranges corresponding to each recognition element have an overlapped part or are next to each other with respect to all the recognition elements, integration is performed to combine relevant judgment frames into one judgment frame having a contiguous value range. Therefore, a memory capacity corresponding to the auxiliary judgment frames or the reject judgment frames can be reduced, and a judging process can be speeded up.
FIG. 1 depicts an overview of a coin recognizing method according to the present invention.
FIG. 2 is a block diagram of a configuration of a coin recognizing device according to an embodiment of the present invention.
FIG. 3 is an example of a configuration of a sensor unit.
FIG. 4 is a block diagram of a configuration of the sensor unit.
FIG. 5 is an example of a main judgment frame.
FIG. 6 depicts examples of a distribution of sensor values.
FIG. 7 depicts an overview of an automatic generating process for an auxiliary judgment frame associated with an overlap correction of the main judgment frame.
FIG. 8 depicts examples of the auxiliary judgment frame and a reject judgment frame.
FIG. 9 is an example of a relation between the main judgment frame and the auxiliary judgment frame.
FIG. 10 is an example of a relation between the main judgment frame and the reject judgment frame.
FIG. 11 is an explanatory diagram of integration of judgment frames.
FIG. 12 is a flowchart of a process procedure performed by a judging unit.
1 Value range
1a Higher limit value
1b Lower limit value
10 Coin recognizing device
11 Sensor unit
11ca, 11cb, 11cc Sensor
11da, 11db, 11dc Waveform shaping circuit
11e A/D converter
12 Sensor-value input unit
13 Control unit
13a Main-judgment-frame registration unit
13b Auxiliary-judgment-frame registration unit
13c Reject-judgment-frame registration unit
13d Judgment-frame integration unit
13e Judging unit
14 Memory unit
14a Main judgment frame
14b Auxiliary judgment frame
14c Reject judgment frame
100 Coin
200 Lower surface of transport path
300 Transport belt
Exemplary embodiments of a coin recognizing method according to the present invention will be explained below in detail with reference to the drawings. An overview of the coin recognizing method according to the present invention is explained below with reference to FIG. 1, and then an embodiment of a coin recognizing device applied with the coin recognizing method according to the present invention is explained with reference to FIGS. 2 to 12.
FIG. 1 depicts an overview of the coin recognizing method according to the present invention. As shown in FIG. 1, "judgment frame" indicates a set of allowable value ranges 1 (between a lower limit value 1b and a higher limit value 1a) for each recognition element (hereinafter, simply "element") of a sensor value with respect to each denomination. For example, value ranges for elements B to D are set as well as the value range 1 for an element A as shown in FIG. 1. When all sensor values are included in the respective value ranges for the elements, a coin is judged as a denomination corresponding to the judgment frame. The elements include a diameter, a material, a thickness, irregularity, the number of lines of a milled edge, hole information, and bimetal information, for example. The number of the elements is not particularly limited.
A main characteristic of the coin recognizing method according to the present invention is in performing coin recognition by using judgment frames including a main judgment frame, an auxiliary judgment frame, and a reject judgment frame, as shown in FIG. 1. The main judgment frame is a judgment frame as a base, and the auxiliary judgment frame is a judgment frame for passing coins that are rejected by the main judgment frame but are originally not to be rejected. The reject judgment frame is a judgment frame for rejecting coins that are passed by the main judgment frame or the auxiliary judgment frame but are originally not to be passed.
One or more auxiliary judgment frames and one or more reject judgment frames are associated with the main judgment frame corresponding to a specific denomination. As many sets of the judgment frames as the denominations are prepared. As described above, in the coin recognizing method according to the present invention, three types of changeable judgment frames are registered (see
in FIG. 1), and coin recognition is performed by using these judgment frames (see
in FIG. 1). That is, conditions on coins that are exceptionally allowed to pass or coins that are exceptionally rejected are defined as the auxiliary judgment frame or the reject judgment frame while using the main judgment frame as the base. In this way, addition or change of a recognition target, or change of recognition details can be flexibly addressed.
In the coin recognizing method according to the present invention, when the main judgment frames overlap with each other, for example when a main judgment frame for a denomination A and a main judgment frame for a denomination B overlap with each other with respect to all elements, correction is performed to correct the main judgment frames not to overlap with each other with respect to a predetermined element. An auxiliary judgment frame for judging coins of the denomination A included in an overlapped part with respect to the adjusted element, and an auxiliary judgment frame for judging coins of the denomination B are automatically generated. Details thereof are explained later with reference to FIG. 7. An embodiment of a coin recognizing device adopting the coin recognizing method according to the present invention shown in FIG. 1 is explained below with reference to FIGS. 2 to 12.
Embodiment
FIG. 2 is a block diagram of a configuration of a coin recognizing device 10 according to the present embodiment. Only constituent elements required to explain characteristics of the coin recognizing device 10 are shown in FIG. 2, and descriptions of a transport mechanism for coins and the like will be omitted.
As shown in FIG. 2, the coin recognizing device 10 includes a sensor unit 11, a sensor-value input unit 12, a control unit 13, and a memory unit 14. The control unit 13 includes a main-judgment-frame registration unit 13a, an auxiliary-judgment-frame registration unit 13b, a reject-judgment-frame registration unit 13c, a judgment-frame integration unit 13d, and a judging unit 13e. The memory unit 14 stores a main judgment frame 14a, an auxiliary judgment frame 14b, and a reject judgment frame 14c.
The sensor unit 11 is a group of sensors provided on a transport path on which coins are transported, and performs a process of transmitting sensor values obtained at passage of a coin to the sensor-value input unit 12. The sensor unit 11 is explained in detail with reference to FIGS. 3 and 4. FIG. 3 is an example of a configuration of the sensor unit 11. In FIG. 3, reference numeral 11a denotes a top view of the sensor unit 11, 11b denotes a side view of the sensor unit 11, and 11ca, 11cb, and 11cc denote section views of the sensor unit 11 along lines A, B, and C shown in FIG. 3, respectively.
As shown in FIG. 3, a coin 100 as a recognition target is transported by a transport belt 300 in a state where the coin is pressed on a lower surface 200 of the transport path. Sensor values are obtained by the sensors included in the sensor unit 11 while the coin 100 passes through the sensor unit 11. For example, sensors that detect a diameter of the coin 100 with combinations of coils 103a and 103c, and coils 103b and 103c are shown by 11ca of FIG. 3.
A sensor that detects a material or a thickness of the coin 100 with a combination of coils 103d and 103e is shown by 11cb of FIG. 3. A sensor that detects reflectivity or the like of the coin 100 with a light receiving/emitting element 103f is shown by 11cc of FIG. 3. The sensors shown in FIG. 3 are merely examples and other types of sensors can be used. The number of sensors is not particularly limited, and a combination of values detected by the sensors can be used as a sensor value.
FIG. 4 is a block diagram of a configuration of the sensor unit 11. As shown in FIG. 4, an output signal from a sensor A 11ca is shaped by a waveform shaping circuit 11da and then inputted to an A/D (analog/digital) converter 11e. An output signal from a sensor B 11cb is shaped by a waveform shaping circuit 11db and then inputted to the A/D (analog/digital) converter 11e.
Similarly, an output signal from a sensor C 11cc is shaped by a waveform shaping circuit 11dc and then inputted to the A/D (analog/digital) converter 11e. The A/D converter 11e outputs the signal values to the sensor-value input unit 12 as digital data. While the three sensors are shown in FIG. 4, the number of sensors is not particularly limited.
The sensor-value input unit 12 outputs the sensor values received from the sensor unit 11 to the judging unit 13e of the control unit 13. When coins are practically flowed through the coin recognizing device 10 to newly generate the main judgment frame 14a, the sensor-value input unit 12 also outputs the sensor values to the main-judgment-frame registration unit 13a of the control unit 13. When the auxiliary judgment frame 14b or the reject judgment frame 14c is to be generated by flow of coins, the sensor-value input unit 12 also can output the sensor values to the auxiliary-judgment-frame registration unit 13b or the reject-judgment-frame registration unit 13c of the control unit 13.
The control unit 13 is a processor that performs a process of registering the judgment frames (the main judgment frame 14a, the auxiliary judgment frame 14b, and the reject judgment frame 14c) corresponding to each denomination in the memory unit 14, and also performs a denomination judging process using the judgment frames. The control unit 13 is also a processor that, when a plurality of the auxiliary judgment frames 14b or a plurality of the reject judgment frames 14c are registered for a specific denomination, performs a process of reducing a memory area for the judgment frames by integrating the judgment frames overlapped.
The main-judgment-frame registration unit 13a is a processor that performs a process of generating the main judgment frame 14a for each denomination to be recognized by the coin recognizing device 10 based on the output from the sensor-value input unit 12 obtained when coins associated with a specific denomination are flowed, and registering the generated main judgment frame 14a in the memory unit 14. The main-judgment-frame registration unit 13a is also a processor that performs a process (an overlap correction process) of performing an overlap check (a lap check) for the main judgment frames 14a corresponding to respective denominations, and performing correction so that the relevant main judgment frames 14a do not overlap with each other.
In the present embodiment, the example where the main judgment frame 14a is generated by practically flowing coins in judgment frame generation is explained. However, the main judgment frame 14a that is generated by any other coin recognizing devices 10 or an external device can be registered in the memory unit 14a through the main-judgment-frame registration unit 13a.
An example of the main judgment frame 14a is explained with reference to FIG. 5. FIG. 5 is one example of the main judgment frame 14a. As shown in FIG. 5, the main judgment frame 14a is data in a table form (a row/column form), for example. As many "higher limits" indicating higher limit values and "lower limits" indicating lower limit values in value ranges of elements as the elements are defined in a "column" direction of the table. Data in a row shown in FIG. 5 correspond to each denomination, and as many "rows" as the denominations are prepared in the table.
For example, in data of a first row corresponding to a denomination .alpha., a higher limit of an element A is .alpha.AH and a lower limit thereof is .alpha.AL, a higher limit of an element B is .alpha.BH and a lower limit thereof is .alpha.BL, and a higher limit of an element C is .alpha.CH and a lower limit thereof is .alpha.CL. In data of a second row corresponding to a denomination .beta., a higher limit of the element A is .beta.AH and a lower limit thereof is .beta.AL, a higher limit of the element B is .beta.BH and a lower limit thereof is .beta.BL, and a higher limit of the element C is .beta.CH and a lower limit thereof is .beta.CL.
A procedure of defining the "higher limit" and the "lower limit" of each "element" shown in FIG. 5 is explained with reference to FIG. 6. FIG. 6 are examples of distribution of the sensor values. FIG. 6
depicts a case where a distribution of the sensor values is near a normal distribution, FIG. 6
depicts a case where a distribution of the sensor values is shifted toward the higher limit, and FIG. 6
depicts a case where a distribution of the sensor values is shifted toward the lower limit. Reference numeral 106a in FIG. 6 denotes a minimum value (MIN) in the distribution of the sensor values, 106b denotes a maximum value (MAX) thereof, and 106c denotes an average value (AVE) thereof.
To define the "higher limit" and the "lower limit" of each "element" shown in FIG. 5, a predetermined number (50, for example) of coins of a denomination corresponding to the main judgment frame 14a to be generated are first flowed through the coin recognizing device 10. A distribution state of the sensor values of each element such as the material, the diameter, and the thickness is then obtained through the sensor-value input unit 12. The main-judgment-frame registration unit 13a defines the "higher limit" and the "lower limit" of each element by using a statistical method.
Specifically, the maximum value (MAX) and the minimum value (MIN) are obtained for each element, and then the average value (AVE) is calculated. A difference (.DELTA.H=MAX-AVE) between the maximum value and the average value, and a difference (.DELTA.L=AVE-MIN) between the average value and the minimum value are then calculated. Whether the distribution is near the normal distribution or is a distribution shifted toward the higher or lower limit is judged based on a value (A=(.DELTA.H-.DELTA.L)/.sigma.), which is obtained by dividing a difference between ".DELTA.H" as a distribution on the higher limit side and ".DELTA.L" as a distribution on the lower limit side by a standard deviation .sigma., then defining the "higher limit" and the "lower limit" of each element.
For example, when "-2.ltoreq.A.ltoreq.2", it is considered that the distribution has a profile close to the normal distribution (see FIG. 6(1)), and therefore the higher limit is defined as "AVE+5.sigma." and the lower limit is defined as "AVE-5.sigma.". When "A<2", it is considered that the distribution has a profile broader on the lower limit side (see FIG. 6(2)), and therefore the higher limit is defined as "AVE+3.sigma." and the lower limit is defined as "AVE-7.sigma.". When "A>2", it is considered that the distribution has a profile broader on the higher limit side (see FIG. 6(3)), and therefore the higher limit is defined as "AVE+7.sigma." and the lower limit is defined as "AVE-3.sigma.".
The main judgment frame 14a corresponding to a specific denomination is generated (corresponding to each row in FIG. 5) by performing the defining process for the higher and lower limits with respect to all the elements. The table as shown in FIG. 5 is generated by performing the same process also for other denominations.
When the main judgment frame 14a corresponding to each denomination is generated, the main-judgment-frame registration unit 13a performs the overlap check (the lap check) of the main judgment frame 14a corresponding to each denomination. An overview of the overlap check (the lap check) is explained below with reference to FIG. 5 already shown. In the overlap check (the lap check), whether value ranges (ranges between the higher and lower limits) of respective elements for each denomination overlap with each other is checked.
For example, in the overlap check for the denominations .alpha. and .beta. with respect to the element A, it is assumed that a condition 1 is defined as ".alpha.AH-.beta.AL>0" and ".alpha.AL-.beta.AH>0", and a condition 2 is defined as ".alpha.AH-.beta.AL<0" and ".alpha.AL-.beta.AH<0". When the condition 1 or 2 is satisfied, it is judged that "the denominations .alpha. and .beta. have no overlapped area in the element A". When neither the condition 1 nor 2 is satisfied, it is judged that "the denominations .alpha. and .beta. have an overlapped area in the element A".
When the judgment is performed for all the elements and then it is judged that "there is no overlapped area" in at least one of the elements, both of the relevant denominations do not become targets for the overlap correction process. When it is judged that "there is an overlapped area" in all the elements, both of the relevant denominations are handled as targets for the overlap correction process. While the overlap check for the denominations .alpha. and .beta. has been explained here, the overlap check is performed for all pairs of denominations. In the example shown in FIG. 5, the overlap checks for the denominations .alpha. and .beta., the denominations .alpha. and .gamma., and the denominations .beta. and .gamma. are performed.
A process of performing correction (an overlap correction process) to prevent overlap of the main judgment frames 14a that have been judged "there is an overlapped area" in all the elements as a result of the overlap check (the lap check) is explained. An example in which the denominations .alpha. and .beta. shown in FIG. 5 are judged that "there is an overlapped area" in all the elements is explained below.
In this example, a difference of the average values of the sensor value distributions with respect to the elements is divided by a sum of the standard deviations (.sigma.) of the sensor value distributions with respect to the elements, and an absolute value of the resultant is calculated as a value (TH). One of the elements having a largest TH is selected as an element for a correction target. Here, TH is expressed by "TH=ABS((AVE of the denomination .alpha.-AVE of the denomination .beta.)/(.sigma. of the denomination .alpha.+.sigma. of the denomination .beta.))", where "ABS" indicates an absolute value.
Upon determination of the element as the correction target, the overlap correction process is then performed. An example in which the "element A" shown in FIG. 5 is selected as the correction target, and the average value (AVE) of the sensor value distribution with respect to the element A of the denomination .alpha. is larger than the average value (AVE) of the sensor value distribution with respect to the element A of the denomination .beta. is explained.
In this example, "X" obtained by an expression "X=AVE of the denomination .alpha.-TH.times..sigma. of the denomination .alpha." is set as the "lower limit" of the element A in the denomination .alpha., and "X-1" is set as the "higher limit" of the element A of the denomination .beta.. In this way, the main judgment frame 14a corresponding to each denomination is adjusted to prevent the value range for at least one of the elements from overlapping with the value ranges of the other elements.
The auxiliary-judgment-frame registration unit 13b is explained next. The auxiliary-judgment-frame registration unit 13b is a processor that performs a process of registering, in the memory unit 14, the auxiliary judgment frame 14b as a judgment frame for passing coins that are rejected by the main judgment frame 14a but are originally not to be rejected. When the "higher limit" or the "lower limit" of a specific element of the main judgment frame 14a is corrected in the overlap correction process by the main-judgment-frame registration unit 13a, the auxiliary-judgment-frame registration unit 13b also performs a process of automatically generating the auxiliary judgment frame 14b for judging data of both denominations included in the ranges before the correction to be the corresponding denominations, respectively.
The description continues in the full USPTO document.
About 6,458 words. The USPTO PDF has it with every drawing.
Fees are due 3.5, 7.5 and 11.5 years after grant. This patent expired on October 15, 2025, so the fee marked "not paid" was the one that went unpaid.
Coin recognizing device and coin recognizing method
Filed Apr 2008 · published Jan 2011Coin recognizing device and coin recognizing method
Filed Apr 2008 · granted Oct 2013Earlier publications, parents and continuations. None of them can still be enforced, or this patent would not be listed.
Prior art cited by the examiner or applicant. Useful when you check your own idea for novelty.
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